Marsh horsetail
Equisetum palustre has fewer, less divided branches and is toxic to livestock.
Use the botanical sourceExtra care needed
Field horsetail.
Equisetum arvense
Also found as Common horsetail
A spore-bearing relic plant with jointed, hollow green stems and whorls of needle-like branches.
Sources checked 27 September 2026 · Specialist field review pending
Before any gathering or use
Contains thiaminase and can deplete vitamin B1. Not for long-term use, children, pregnancy, or people with kidney disease. Marsh horsetail is more toxic.
Where it grows
Tracked records and known growing zone
- Verified records
- 70,357
- People who recorded it
- 26,648
- Most records (northern hemisphere)
- Apr–Jun
- Records span
- 1964–2026
| January | 18 |
|---|---|
| February | 50 |
| March | 1252 |
| April | 14765 |
| May | 20855 |
| June | 13654 |
| July | 8497 |
| August | 5979 |
| September | 3153 |
| October | 1499 |
| November | 384 |
| December | 44 |
Research-grade iNaturalist records, snapshot Aug 27, 2026. The growing zone combines areas where different people have repeatedly verified it. Records show where people looked and found it, not current abundance or permission to gather.
01 / Learn to see
Field marks
- 01
Jointed, hollow, ridged stems with toothed sheaths at each node.
- 02
Whorls of slender green branches in sterile summer stems.
- 03
Brown, unbranched fertile stems with a cone tip appear in early spring.
These are study prompts, not a complete identification key. Confirm the full plant with a regional flora and an experienced local identifier.
02 / Resolve the differences
Look closely. Compare.
Selected comparisons only. Other lookalikes may occur locally.
03 / Meet the place
Habitat & season
Range context
Widespread across the Northern Hemisphere.
Watch the plant stage
Sterile stems from late spring to summer.
Stage guidance is not a local forecast. Check your climate, elevation and a regional source; no month-shift formula is used here.
04 / Gather with care
Documented use & care
Parts discussed: Sterile stem
Used traditionally as a short-term tea. Not a food plant.
Care for the patch
Common in disturbed ground; gather sparingly from clean sites.
Preparation & storage essentials05 / Follow the evidence
Sources & review
- Wikipedia · Equisetum arvenseBotanical description, range and documented use
- iNaturalist · Equisetum arvenseTaxonomy and verified observation records
Checked 27 September 2026. Original editorial synthesis; source institutions have not reviewed or endorsed this guide. Independent botanical field review is pending. Photos illustrate specimens; they do not certify the identity of a plant you find.
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